A subtype of renal cell carcinoma thought to originate from mature renal tubular cells in the proximal tubule of the nehpron.

Fibrofolliculoma is a clinically asymptomatic, 2-4 mm, skin-colored, dome-shaped smooth papule. It usually arises in the form of multiple lesions in adults in different areas such as the scalp, forehead, face, and neck. According to histology, the lesion is a fibrotic hamartoma characterized by infundibular epithelial proliferation and perifollicular fibrous proliferation.

The presence of multiple lipomas (a type of benign tissue made of fatty tissue).

Perifollicular fibroma is a rare cutaneous hamartoma that shows differentiation in the connective tissue sheath of hair follicles. It can occur as a solitary papule or as multiple lesions. Histologically, the lesion consists of a concentric arrangement of cellular fibrous tissue around a normal hair follicle.

A round circumscribed space within a lung that is surrounded by an epithelial or fibrous wall of variable thickness. A cyst usually has a thin and regular wall (less than 2 mm) and contains air, although some may contain fluid.